- A Cruel Sea - When Reptiles Ruled the Waves
 - Dr. Jo Wright describes life in Jurassic seas for this BBC's segment of the Rise and Fall of the Dinosaurs. - Australian Mesozoic Marine Reptiles
- Profiles of the marine reptiles that lived with in the vast but shallow inland sea that covered most of Australia through the Cretaceous period.
- Big Brook Reptile Page
- Displays the fossils of the mosasaur, plesiosaur, and ancient sea turtles found at Big Brook, New Jersey.
- Fauna of the Jurrasic Sea
- Hauff Museum of the prehistoric world offers profiles of the creatures -- ichthyosaurs, plesiosaurs, marine crocodiles, pterosaurs, and fish -- that resided in the ancient bay that once covered half of Southern Germany.
- History of Life: Modernization of Life and Sea
- Learn about the Mesozoic ocean ecosystems and the marine reptiles that dominated them -- turtles, crocodiles, ichthyosaurs, plesiosaurs, and mosasaurs.
- Marine Reptiles of South Dakota
- Descriptions of the ichthyosaurs, marine turtles, plesiosaurs, and mosasaurs fossils found in South Dakota.
- Marine Reptiles of the Ancient Seas
- Journey Through Time offers profiles and illustrations of the ancient reptiles that adapted to life in the seas: nothosaurs, ichthyosaurs, plesiosaurs, and mosasaurs.
- Mesozoic Marine Monsters of Mangahouanga
- Information about marine fossil environments in New Zealand. Includes fossil photos and diagrams.
- Monsters of the Ancient Sea
- National Geographic interactive feature examining the prehistoric predators whose size and might spun legends that live on today.
- Mosasaur Museum
- Virtual collection of mosasaur specimens from Kansas and elsewhere written and illustrated by Mike Everhart.
- Mosasaurs: Last of the Great Marine Reptiles
- Learn about mosasurs, from their evolution from small terrestrial lizards in the late Jurassic to their demise in the late Cretaceous.
- Oceans of Kansas Paleontology
- Information about fossils from the ocean that covered the Midwestern U.S. during the Age of Dinosaurs, including information about mosasaurs, pleisiosaurs, and pteranodons.
- Origin Energy Fossil Gallery - The Opal Fossils of South Australia
- Explore life from Australia's inland sea during the age of the dinosaurs. Online exhibit offers photographs of the famous opalized Addyman Plesiosaur.
- Wikipedia: Mosasaur
- Article about mosasaurs, the serpentine marine reptiles that were the dominant marine predators during last 25 million years of the Cretaceous Period.
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